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**calc_help123** A) Find the coordinates of the absolute maximum point for the curve

y=xe^(-kx) where k is a fixed positive number.Justify your answer

B) Write an equation for the set of absolute maximum points for the curves y=xe^(-kx) as k varies through positive values

Im not really sure where to start with this. It is a calc ab problem. I think i would start with the derivative which woule be -k x e^(-kx)+e^(-kx). Mr F says: No. You're missing the red x.

After that im not sure where to go